The other day I was driving my truck and I was attempting to assist a friend stuck in ice by pulling him out. When I got there I was unable to put my truck in 4WD. The button signals that it is attempting to and I can hear the transfer servo engaging but it never reports being in 4WD. I later found that I couldn't engage my Cruise Control same day and the next morning my heater fan wouldn't run and being in Alaska it was pretty cold :) I can't guarantee that it was all at the same time but I use all of these features often and it wouldn't have taken long to notice. I have checked the obvious fuses and they are all intact. I am unsure if there is a relay that handles all three systems or not. I have pulled my engine codes and I have two U1000, C0035, and P0101. The U1000 is likely my information cluster as it is currently dead. I need to replace it or the cable connecting it but I am not certain since it is a generic error. The C0035 is my in tire speed sensor and that is only causing my speed gauge to be off by 10% The P0101 is my K&N filter and this is apparently common. Thanks in advance for any assistance.
Lost 4WD transfer, Cruise Control, AC Blower fan at same time. Cannot find cause on 2004 GMC Sierra 2500 HD
by symbiant in Anchorage, AK on April 28, 2013
ANSWER by globalhelper , April 29, 2013
scan all modules for codes and post so we can adv. could be related to several malfuntioning systems